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    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        /* 
            Promise 常用 API
                1. p.then()    得到异步任务的正确结果
                2. p.catch()   捕获异常信息
                3. p.finally() 成功与否否将执行(兼容性，最新浏览器支持)
        */
        // 见原型    
        console.dir(Promise);
        let p = new Promise(function (resolve, reject) {
            setTimeout(() => {
                resolve("success");
                // reject("error");
            }, 100)
        });

        p.then(function (data) {
            console.log(data);
        })
        .catch(function (data) {
            console.log(data);
        })
        .finally(function () {
            console.log("finished");
        });
        console.log('---------等效写法----------');
        p.then(function (data) {
            console.log(data);
        }, function (data) {
            console.log(data);
        })
        .finally(function () {
            console.log("finished");
        });
    </script>
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